Ilia Mashkov
39 lines
1.0 KiB
TypeScript
39 lines
1.0 KiB
TypeScript
const MONTH_FMT = new Intl.DateTimeFormat('en-US', { month: 'short', year: 'numeric', timeZone: 'UTC' });
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function formatMonthYear(date: Date): string {
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return MONTH_FMT.format(date);
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}
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/**
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* Formats a PocketBase date string into a localized month+year range or "Present".
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* @throws {Error} if any date is invalid or if the range is logically impossible.
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*/
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export function formatMonthYearRange(start: string, end: string | null): string {
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const startDate = new Date(start);
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if (Number.isNaN(startDate.getTime())) {
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throw new Error('Invalid start date');
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}
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if (end === null) {
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return `${formatMonthYear(startDate)} — Present`;
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}
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const endDate = new Date(end);
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if (Number.isNaN(endDate.getTime())) {
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throw new Error('Invalid end date');
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}
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if (startDate > endDate) {
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throw new Error('Start date cannot be after end date');
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}
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const startLabel = formatMonthYear(startDate);
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const endLabel = formatMonthYear(endDate);
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if (startLabel === endLabel) {
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return startLabel;
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}
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return `${startLabel} — ${endLabel}`;
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}
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